You have selected more than 16 key fields

What causes this issue?

You want to create an open hub destination with a database table as the
destination and a semantic key. You have selected more than 16 key
fields.

System Response

The open hub destination cannot be created.

How to fix this error?

Select 16 key fields or less.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.